I would say the closer you are to their answer, the higher you will score. So they will be quite strict IMO.
You don't have to use exactly the same words they use but you must suggest the same idea. (ie: in the 2010 response, Author wants students to enter universities based own their own interests and career rather than entering universities just because they are famous). In the 2010 exam, they basically wanted a summary of the last paragraph (which showed the author's reasoning) in one sentence to show you understood it.
Also I remember when I did that exam for practice, i got confused with the use of えらんでもらいたい to end the sentence. I myself got the incorrect meaning when doing it in class, I thought it was saying that's what IS happening now. But of course the use of えらんでもらいたい means that is what the author wants to happen in the future. Look out for the endings of sentences!
They didn't have such a question last year, so can't say for sure what will happen tomorrow. But good luck!
Try not to panic. Even with those conclusion type questions, the answer is still in the text. I would suggest to underline words in the text that look relevant (ie: in 2010 exam, 勉強の目的 and 将来の仕事) and use those in your response.
Also look how in responses in the assessors report, the grammar in the text has been changed.
有名な大学ではなくて is altered to 有名な大学に行くより in the assessors report.
きめたほうがいい is altered to えらんだほうがいい
If you can think of tweaking the wording and usage of grammar in the text, that will give you extra marks.
Also, you can write articles in plain form (ie: ending with ~だ、~ある). Don't use casual spoken form as it is a writing piece (ie: ~ちゃった、~なきゃ). The exception is unless you are using something as an example and put the casual speech in quotation marks.